net/mlx5e: kTLS, Fix incorrect page refcounting

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[ Upstream commit dd6e972cc5 ]

The kTLS tx handling code is using a mix of get_page() and
page_ref_inc() APIs to increment the page reference. But on the release
path (mlx5e_ktls_tx_handle_resync_dump_comp()), only put_page() is used.

This is an issue when using pages from large folios: the get_page()
references are stored on the folio page while the page_ref_inc()
references are stored directly in the given page. On release the folio
page will be dereferenced too many times.

This was found while doing kTLS testing with sendfile() + ZC when the
served file was read from NFS on a kernel with NFS large folios support
(commit 49b29a573d ("nfs: add support for large folios")).

Fixes: 84d1bb2b13 ("net/mlx5e: kTLS, Limit DUMP wqe size")
Signed-off-by: Dragos Tatulea <dtatulea@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/20241107183527.676877-5-tariqt@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Dragos Tatulea 2024-11-07 20:35:24 +02:00 • committed by Greg Kroah-Hartman

parent bfba288f53

commit 69fbd07f17

1 changed files with 4 additions and 4 deletions

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drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls_tx.c

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